Question

What do you mean by uncertainty in measurement?

Answer 1

whenever you measure something like measuring the length of your scale, there is uncertainty that you can not measure below 0.1 cm which is called uncertainty in measurement.

Answer 2

$\Large{\underline{\underline{\bf{Solutionn:}}}}$

☯ Uncertaininty in measurment

When true value is not equal to experimemtal calculations then there os uncertainty in measurment.

↪ For example 2g of $\sf{H_2}$ molecules = 602,200,000,000,000,000,000,000

But if we write (602,200,000,000,000,000,000,000) as 6.022 $\times$ 10²² then our uncertainty in measurement can reduce.

$\rule{150}{2}$

Now, Mass of H atom.

0.00000000000000000000000166

But if we write (0.00000000000000000000000166) as 6.61 $\times 10^{-25}$ then our uncertainty in measurement can reduce.

→ Meaningful to present the data, realisitiolly accurating with uncertainity.

$\rule{200}{2}$

★ There are three ways to reduce the uncertainty in measurement.

(i) Scientific Nitation

(ii) Significant figures

(iii)Dimensional analysis.